BrowserApplication.
This functionality is supported only if you are using the Open Agent.
Closes all tabs but the selected one.
browserWindow.CloseOtherTabs()
When several tabs are open, the browser only displays some of the tabs and scroll buttons. CloseOtherTabs closes all other tabs except for the selected one, including the tabs that are not currently visible.
InternetExplorer.CloseOtherTabs()